微型桩支撑引板的无缝桥试设计研究-《建筑科学与工程学报》

文章信息/Info

Title:: Trial-design Study on Jointless Bridge with Approach Slab Supported by Micro-piles

Author(s):: FU Cui, ZHUANG Yi-zhou, CHEN Bao-chun; College of Civil Engineering, Fuzhou University

Keywords:: micro-pile; jointless bridge; trial-design; finite element model; pile-soil interaction; seismic response; time history analysis

摘要:: 为研究微型桩支撑引板的无缝桥受力性能，进行了这种新型无缝桥的试设计，采用MIDAS/Civil建立了考虑微型桩土相互作用的全桥空间有限元模型，对比分析了试设计桥与原桥在恒载作用、汽车荷载作用、引板沉降下的受力行为，以及温度作用、收缩徐变效应、引板与接线路面间伸缩量下的受力行为；采用模态分析和地震时程分析方法研究了桥梁自振特性和地震响应。结果表明：竖向荷载作用下试设计桥的主梁边跨正弯矩减少，同时引板沉降减少；微型桩的约束作用会使主梁在升温、降温、收缩徐变作用下的轴力增大；试设计桥在地震荷载作用下位移反应减少，提高了桥梁的抗震性能；该研究成果可为微型桩支撑引板的无缝桥设计提供借鉴，对该新型无缝桥在实际工程中的应用和发展起到推动作用。

Abstract:: In order to study the mechanical behavior of jointless bridge with approach slab supported by micro-piles, trial-design of the new type structure was carried out, and the full bridge spatial finite element model considering micro-pile-soil interaction was built by MIDAS/Civil. The mechanical behaviors of the trial-design bridge and the original bridge under constant load, automobile load and approach slab settlement were compared and analyzed. The mechanical behaviors of the bridges under temperature, shrinkage and creep, and the expansion between approach slab and approach pavement were also analyzed. The natural vibration characteristics and seismic response of the bridge were studied by modal analysis and seismic time history analysis. The results show that the positive bending moment of the side span of the trial-design bridge main beam under vertical load decreases, while the settlement of approach slab decreases. The restraint effect of the micro-pile will increase the axial force of the main beam under the influence of temperature rise, temperature drop, and shrinkage and creep. The displacement response of the trial-design bridge under seismic loading is reduced, and the seismic performance of the bridge is improved. The study can provides references for the design of jointless bridge with approach slab supported by micro-piles, and can promote the development and application of this new kind of jointless bridge in the actual engineering.